$\int \cos (\log _e x) dx$ નું મૂલ્ય કેટલું થાય? (જ્યાં $C$ એ સંકલનનો અચળાંક છે.)

  • A
    $x[\cos (\log x)-\sin (\log x)]+C$
  • B
    $\frac{x}{2}[\sin (\log x)-\cos (\log x)]+C$
  • C
    $\frac{x}{2}[\sin (\log x)+\cos (\log x)]+C$
  • D
    $x[\cos (\log x)+\sin (\log x)]+C$

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જો $\int {e^x \sin x \, dx} = \frac{1}{2} e^x \cdot a + c$ હોય,તો $a = $

જો $\int x^2 \cdot e^x dx = e^x f(x) + c$ હોય, તો $f(x)$ ની ન્યૂનતમ કિંમત શું છે?

$\int (\log x)^2 \, dx = $

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